Cam lever closing arrangement for pressure cooking pots



A. R. PAGANO Feb." 6, 1934.

CAM LEVER CLOSING ARRANGEMENT FOR PRESSURE COOKING POTS Filed April 11932 Patented Feb. 6, 1934 PATENT OFFICE CAM LEVER, CLOSING ARRANGEMENT'FOR PRESSURE COOKING POTS Andrea Riccardo Pagano, Genoa, ItalyApplication April 18, 1932, Serial No. 605,998, and in Italy April 17,-1931 (Granted under the provisions of sec. 14, act of March 2, 1927; 3570. G.

3 Claims; (01. 220-47) This invention relates to the closing devices Vfor pressure resisting containers and especially for cooking pots fordomestic as well as for industrial use, and its main object is toprovide a 5 closing system that is simple, to be relied upon and adaptedto avoid that the cover of the pot may be blown off when a pressureexists in the .pot.

Another object of the invention is to provide an improved closing systemespecially adapted for pressure cooking pots, by which a perfect closureis attained by an absolutely equal compression of the tightening. ringfitted to the cover rim.

A further object of the invention is to provide an improved closingsystem that is suitable for use on large pots or industrial pressurecooking containers, in which the closure is obtained almostinstantaneously and by a minimum force.

Some embodiments of the invention are shown on the annexed drawing, inwhich: 1

Figure 1 is a vertical section through the upper portion of a pressurepot fitted with the improved closure of the invention; I

Figure 2 is a top plan view of the same;

Figure 3 shows another embodiment of the invention for small pots or forpots of elongated section; L

Figure 4 shows a simplified system for relatively small pots; and

01 the pot. The upper ends of said brackets are forked and the prongs ofthe iorked end of bracket 2 are provided with a transversal stud 4 forengagement with the end notch 5 of the yoke 6. This yoke is formed atits centre portion with a suitable projection 7 adapted to bear againstsuitable abutment members, and in the present instance, against theinner ends of a number of balance levers 8 fulcrumed to suitable posts 9rigidly attached to the cover 10. The outer ends of these levers 8 carryhooks 11 pivotally attached thereto and adapted toengage the undersideof the projecting flange of the pot. The pressure of yoke 6, through itsprojection 7, against the abutment ends of levers 8 is controlled camlever 13 the pivots-14 of which engage in a seat formed at the forkedend of bracket 3.

By the just described system, by setting the cover 10 on 'the pot 1, thehooks 11 engage the underside of the projecting border of the pot. Thelever 6 is then fitted in place by inserting its notch 5 under the stud4 so that the projection 7 abuts against the inner ends of levers 8.Then the cam lever 13 is set in place by inserting its pivots 14 throughthe mouth 15 of their seats. In order to permit this insertion, thepivots are formed preferably as shown in detail in Figure 5 i. e. aportion thereof is cut away, to allow the insertion of the said pivotsor their egress only at or near the opening position of the lever 13.

It is apparent that by this system the cover 10 cannot be blown away byinternal pressure, as even if lever 13 were open while a certainpressure is in the pot, the cut pivots 14 during their movement to theopening position would be pressed against the top end of their seats andthus in the opening position of lever 13, the edges of the pivots 14 atthe out side thereof would be slightly above the upper edge' of the seatmouth 15.

This just described system is especially adapted for pressure pots oflarge dimensions, in which a thoroughly equal pressure of the crown ofcoacting hooks 11. and posts 9 on the cover, due to the engagement withthe part 12, is ensured.

Another embodiment of the closing system for pressure pots employing apair of balance'levers- 8 fulcrumed on to posts 9 rigidlyfastened to thecover 10 is shown in Figure 3. In this case,'after having set the cover10,- it is rotated to bring the levers 8 under the lugs 16 formed underthe forked ends 01' brackets 2 and 3. Then the cam lever 13is insertedand is rotated through about 270, as in the former instance. Thetightening takes place by transmission of the force on to the posts 9and through these vertically on the cover. It is evident that, in thiscase, the fulcrum of the levers 8, while their outer end is engagedunder 16, comes to be just at this end.

In Figure 4 a further embodiment is shown for small cook pots for familyuse.

Even by this embodiment the brackets 2 and 3 are rigidly attached to thesides of the pot, and the yoke 6 through a suitable projecting memberpresses to the center of the cover. Also in this case the engagement ofthe yoke 6 and the form and method of fitting of the cam lever 13 arethe same as in the previous cases and this lever, having been arrangedat the end of yoke 6 and bycoming to its maximum excentricity only afterabout of'a tum from the idle position (shown in Figure 4), the forcethat is necessary for tightly closing the cover becomes insignificant.

It is apparent that the above described device may be widely variedthough remaining within the scope of the appended claims.

I claim:

1. In a. system for tightly closing pressure pots and like containers, apair of opposite brackets rigidly attached to the pot and having forkedends, a stud connecting the prongs of the forked ends of one of thebrackets, pivot hearings on the other bracket having entrance slots, acam lever having rigid pivots cut partially along a plane parallel totheir axis and in the direction of the arm of the lever and adapted tobe inserted in the said slots only in the position of minimumexcentration of the said cam, a yoke having a notch at one end forengaging said stud and having the other end engaged by the cam lever, acover for the pot adapted to tightly close the said pot, and means onthe cover adapted to coact with the center of the said yoke and totightly close the cover of the pot when being depressed by the said yokeupon operation of the said cam lever in one direction and to release thepressure on the cover of the pot when turned in opposite direction, thewhole being so arranged as to permit the egress of the cut pivots ofsaid cam lever only in case no upward pressure is exerted through saidyoke on the cam lever.

-2. A system for closing pressure cooking pots according to claim 1, inwhich the means for transmitting the closing pressure to the cover ofthe pot comprise a projection on the middle portion of said yoke, and anumber of balance levers fitted radially on suitable posts fastened totne cover of the pots and having their inner ends adapted forcooperation with the middle projection of the yoke, while their outerends are adapted to engage a part integral of the cooking pot.

3. A system for closing pressure cooking pots according to' claim 1, inwhich the means for transmitting the closing pressure to the cover ofthe pot comprise a projection at the middle portion of the said yoke, apair of balance levers diametrically fitted on suitable posts fastenedto the cover of the pot and having their inner ends adapted forco-operation with the middle projection of the yoke and projecting lugson the said rigid brackets under which the outer balancelever endsengage.

ANDREA RICCARDO PAGANO.

